Is there any relation between Movie Clip Editor and Video Sequence Editor?
In the Movie Clip Editor you can define the duration of the clip by setting start and frame offset and using the Footage settings tab.



The events on the Video sequence editor are not connected with the Movie Clip Editor in any way. The VSE has its own viewer, unrelated to the MCE . You can only load Strips and edit on the VSE. The 3D scene can be loaded into the VSE as a strip, but the events on the VSE are not available in the 3D environment. There is an addon to send VSE strips to the compositor and back (link to blenderartist's thread), but it's not a fully implemented solution yet.